指针 打印

//指针



#include <stdio.h>
int main()
{
    int num = 9;
    int *ptr_num1 = &num;

    //int *ptr_num2 = &ptr_num;   //指针的地址
    int **ptr_num2 = &ptr_num1;


    printf("num变量的地址是：%p\t%x\n",ptr_num1,&num);   //%p指针占位符 %X16进制占位符
     printf("ptr_num对应的值为：%d\t%d\t",num,*ptr_num1);         // 9

    //通过指针的指针。访问原指针指向空间的值时，同样需要俩个星号
    printf("指针变量ptr_num1地址是：%p\t%d\t",ptr_num2,**ptr_num2);



    //使用指针修改变量值
    //*ptr_num = 9999;
//    printf("ptr_num对应的值为：%d\n",num);

    return 0;

}